Last-lock.



No. 865,712. PATENTED SEPT. 10, 1907.

' B. 0. KRBNTLBR.

LAST LOCK.

uruourox run) my 2:, 190B.

W595; Jive/em for: g firfi y EM QM ,marisy UNITED STATES PAT Fi l 1OFFICE.

EDWIN 0. KRENTLERWF DETROIT, MICHIGAN, ASSHRNUR 'lO KRENTLERFARNOLDHINGE LAST COMPANY, OF DETROIT, MICHIGAN, A UlillllUllA'l'lUN OF WESTVIRGINIA.

LAST-LOCK.

Specification of Letters Patent.

Patented Sept. 10, 190?.

Application filed May 21, 1908. Serial K0. 317,882.

ings, is a specification, like letters on the drawings 1 representinglike parts.

For certain purposes, many shoe manufacturers desire 10 that the partsof the hinged last (of the type shown for instance-in my Patent No.764,894 of July 12, 1904).

shell be positively locked together. Various locks for this purpose havebeen suggested and provided, but phe usage of lasts is so rough in mostof the factories,

and the strains on the last. are so complicated and ex- 1mm, that I havefound it desirable and necessary to devise a lock which would provide amore simple and less complicated kind of look, so loaded and arranged tocooperate with the hinge that it may be read- 29 ily operated and yet iscapable of withstanding all the severe usage and strains brought to bearupon it.

'I provide above the ordinary hinge plate a locking piece, operated byan outward pull on s projecting portion, and normally impelled at alltimes toward 25 ldckingsnd tightening position, the hinge plate beingpr'pvided ifll {cooperating notch or shoulder for errgaging the lockingpiece automatically when the last is moved into lengthened position. Thelocking piece and hinge plate stand in one and the some vertical planeand are retained by the side walls of s. kerf which they qmlgly fit,merely the operating projection of the piece being exposed in the opengap of the last shove the hinge plate. 7 Further constructional detailsof my invention will a be pointed oil! 'rh' course of the followingdescriplion, reference being had to the accompanying draw ings, in whichI have shown the best embodiment of my invention at present mmtomplalcdby me.

In the drawings, Figures 1 and 3 are views in side 0 olevstion. of alast embodying my invention, parts being. broken away adjacent thesccanl portion in show more clearly the constructional details; Fig. 2is a [ragmontary view thereof in .top plan, parts being broken away; andFig. 4 is unenlargcd view in side elevation.

$ of the hinge connection and locking means, showing more clearly theconstruction and principle of oporntion.

The forcpa'u-t l and hoelpart 2 of the lost may be of any usual orpreferred construction, being herein shown as of the identicalconstruction shown in my before-mew linnwl potent. My lullock i8intended for use wilhwhai is known as the "2-piece knuckle joint last.in which fl oiorcpsrt is pivotally connected at. 3

to [he hcolpori by a vorlicol hinge-plate 4, sccurcd Q5 rigidly to thehoelporf by transverse pins or rivets 5,

. The rear end of the forepart 1 and thoiorward end of the hcolpart 2are separated by an intervening open space 7 when the last is inlengthened position as shown, and the hinge-plate is retained in svertical kcrf 8. Above the hinge-plate, and preferably in the (10 samekcrf, which, for this purpose, is simply sawed longer or higher, I mountalocking piece 9, pivolally supported oil a pin 10 and forwardly anddownwardly impelled by a spring 11 retained in a, socket 12 in theforopart of the last, said locking'picce having an extension orprojecting portion 13 extending upwardly above the engaging and orlooking portion of the locking piece and the hinge-plow and oxlcmlinginto the gap or V-shaped opening Y. llom'mh Ibis projection or lockingpiece 9 is o Sllfillltlvf l l or -ngngiug a corrospondingly shapedshouldcr l3 l'xll-mllng upwardly from the hinge-plate 4. Th0 \':-lllnnof the pin 10 with relation to the swinging mow-mom of the heelpsrt. 2and hinge-plate 4 is such that the resisting pressure or locking strainof the contacting shoulders l4. is

brought in direct line with lhe pin ID at all limos, so

lhat thereby the groalcst slrcnglh and stability of position areassured. The prcssul'c or i-csislancc of said surl'nccs is transmitteddirectly along a line exlnding from the pivot 10, or, in other words,the engaging surfaccs 14, 15, are approximately at right angles to theradius from said pivot. .The locking or enpaging surfaces and the pin 10are in a line approximately tengenlinl to the swinging movement of thehinge-plate 4 about its router of movement 3, or preferably the pin li)lies slightly outside of said tangential line.

It will be observed also that in my prclcrrcd construction as horcinshuwh, the surfaces 14 and 15 are wedgeshoped with relation to theswinging movement of the locking piece 9, or are not exactly at rightanglee to said are of movement, the surface 14 being prefcrobly formedon the circle shown in dotted lines in Fig. 4, eccentric to the pin 10.This is for the purpose of taking up all wean of the locking surfaces 14and 15 without permitting any loosoness or uncertainty of lockingaciion. The locking piece is retained snugly by the side walls of itsholding kerf, said locking piece being set back almost entirely withinthe wood of the last so that. it. cannot possibly bccomq beut ordisarrangcd, but must M; all times stand edge'wise in correct alincmcntwith the hinge-plato 4, so as to tranpmit all closing strains of thelost directly to the pin 10, lhorcby insuring great. strength,pvrumnoncy, and ondursnce. At the some time the conslructiuu is(-xm-mlingly simple and inexpensive.

Having described my invention. what I claim as new and desire to secureby Letters Pnlvnt is,

l. A dividql inst, lmvlm; its hflllnllt and (oi-cont pivomlly cufmcclcdby a verllrnl hinge-plai a shoulder in? log provided: the upper edge orsold Mode-plate, sad I 1 locking plate set on edge in the same verticalplane as said hingepluie and pivotully mounted above the latter in one(if said parts: said lurking} plate having a shoulder for. engagin i'hvHhullidtl ui mid hingtvpiuic, and being pru- Uided' with pl'ujvvtiunvxlending upwardly aia ve the locking puliinn at tho lu king plate intnilmnpvn space above said iliimmflatr, and a spring for always hnpeilinsaid lurking plnlu tmvaalr: int-him; pufillion.

A dividvd lush rmnp isin r a fnrvpari and a heelpnrt, suparaimi atlln'ir mvrling in|| ands Irv an open space win-n in lrng'lhunt dpusitiun. a hinge-plate cunnerliinr, said twn pairiH rigidly Winn-ml tumm part and provided with an upwardly prnil-t'tinp, shunidul' in muvvwith l'rinlion to ilnliltl part, and a lol-king plate sot on mine insaid utln-r part. in tin.- xame wrticn] plane as said projectingsimnilimg having a un'iprrating shunldur fol engaging saidprnjm'ting"Slmnldvr to lock the last in lengthened pusilinn, saidlocking plate lining pruvillvd with an (Iver hanging, prujectiunextruding: into said upon SIJIH'P allow said hinge-plate. connlrnctmiand urrangrcl to unlock tho parts by an upward swinging movrmvntu! theplate.

locking 3. A divided last, comprising a forepnrt and a heolpart,provided their meeting ends with aimed vertical km'fs, a hinge-platepivotally connecting said two parts mounted in said kertn and providedwith u locking shun] at its edge adjacent the rear wall 0! the torepurt.lot-him: plate set eglgewise in the kerf uf the furepart above saidlocking plate and provided with'a shoulder for nurmnliy engaging thelocking shoulder of said hinge-plate, t1 transverse pin pivotallysupporting said locking plate appruxr lnately in tangential line withthe arc of movement of said hinge-plate, which includes said lockingshoulders and means normally lmpelling said locking plate Inward luckingposition, said locking piate having a rearward vxlunsion prnjectinn'into the open gap almve snirl lurking plalv.

In testimony whereof, I have signed my mum in this .N'llll'iiiCiitiDll,in the presence of two subscribing \vilnesse-s,

human liicmmn, (mm I Ilium.

